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The design and production of the Exec series helicopters began in the early 1990s, starting with the Exec 90. The Exec 90 contained the RI 162 engine, and, unlike previous helicopter kits, much of the assembly, including the welding, was done at the factory. The Exec 90 was followed by the Exec 162F in 1994.
The Hughes Model 269 was known to the U.S. Army as the TH-55 Osage. In 1947, Howard Hughes redirected the Hughes Aircraft Company's efforts from airplanes to helicopters. . The effort began in earnest in 1948, when helicopter manufacturer Kellett Autogiro Corporation sold their latest design to Hughes for product
Stanley Hiller, then seventeen, established the first helicopter factory on the West Coast of the United States, located in Berkeley, California, [1] in 1942, under the name "Hiller Industries," to develop his design for the coaxial-rotor XH-44 "Hiller-Copter" for the U.S. Army.
Helicopter dynamics is a field within aerospace engineering concerned with theoretical and practical aspects of helicopter flight. Its comprises helicopter aerodynamics, stability, control, structural dynamics, vibration, and aeroelastic and aeromechanical stability.
The proposed unit was designated TH28 (TH for "training helicopter" derived from the 28(0), since the Army's proposal was NTH, "new training helicopter"). The Army contract effort was not successful, [ 2 ] but the company effort looked promising enough that management committed to continue with a commercial version, which was introduced in 1993.
Single-rotor helicopters need a mechanism to neutralize the yawing movement produced by the single large rotor. This is commonly accomplished by a tail rotor, coaxial rotors, and the NOTAR systems. Tandem-rotor helicopters, however, use counter-rotating rotors, with each cancelling out the other's torque.
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